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Home >> Lexus >> 2000 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0441: Incorrect EVAP Purge Flow Or DTC P0446: EVAP Vent Control Fault >> Circuit Description

Circuit Description

Vapor pressure sensor, canister closed valve Vacuum Switching Valve (VSV) and pressure switching valve VSV are used to detect faults in EVAP system. ECM determines if a fault is present in EVAP system based on the vapor pressure signal circuit.

DTC P0441 or P0446 is set if EVAP system leak is detected by ECM or if there is a malfunction in EVAP VSV, pressure switching valve VSV, or in vapor pressure sensor. Possible causes are: